CN117367529A - Gas mass flow detection method and device - Google Patents

Gas mass flow detection method and device Download PDF

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Publication number
CN117367529A
CN117367529A CN202311412156.6A CN202311412156A CN117367529A CN 117367529 A CN117367529 A CN 117367529A CN 202311412156 A CN202311412156 A CN 202311412156A CN 117367529 A CN117367529 A CN 117367529A
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CN
China
Prior art keywords
gas
density
mass flow
flow rate
sensor
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Pending
Application number
CN202311412156.6A
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Chinese (zh)
Inventor
裴全斌
徐�明
青青
侯阳
裴勇涛
杨阔
陈正文
陈曦宇
王吉开
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
West To East Gas Transmission Branch Of National Petroleum Pipeline Network Group Co ltd
China Oil and Gas Pipeline Network Corp
Original Assignee
West To East Gas Transmission Branch Of National Petroleum Pipeline Network Group Co ltd
China Oil and Gas Pipeline Network Corp
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Application filed by West To East Gas Transmission Branch Of National Petroleum Pipeline Network Group Co ltd, China Oil and Gas Pipeline Network Corp filed Critical West To East Gas Transmission Branch Of National Petroleum Pipeline Network Group Co ltd
Priority to CN202311412156.6A priority Critical patent/CN117367529A/en
Publication of CN117367529A publication Critical patent/CN117367529A/en
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/8409—Coriolis or gyroscopic mass flowmeters constructional details
    • G01F1/8413—Coriolis or gyroscopic mass flowmeters constructional details means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/76—Devices for measuring mass flow of a fluid or a fluent solid material
    • G01F1/78—Direct mass flowmeters
    • G01F1/80—Direct mass flowmeters operating by measuring pressure, force, momentum, or frequency of a fluid flow to which a rotational movement has been imparted
    • G01F1/84—Coriolis or gyroscopic mass flowmeters
    • G01F1/845—Coriolis or gyroscopic mass flowmeters arrangements of measuring means, e.g., of measuring conduits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/14—Casings, e.g. of special material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
    • G01F15/18—Supports or connecting means for meters

Abstract

The invention relates to a gas mass flow detection method and a device, which can acquire a first mass flow, a first density, a first volume flow and a second density corresponding to gas in a gas transmission pipe. Wherein the first mass flow is determined based on a first mode, the first density is determined based on a second mode, the first volume flow is determined based on a third mode, and the second density is determined based on a fourth mode. The first mode, the second mode, the third mode and the fourth mode are different from each other. The target density is obtained based on the first density and the second density. A second mass flow of gas is determined based on the target density and the first volumetric flow. The mass flow rate of the gas is determined based on the first mass flow rate and the second mass flow rate, thereby improving the accuracy of the mass flow rate detection of the gas.

Description

Gas mass flow detection method and device
Technical Field
The invention relates to the technical field of gas mass flow detection, in particular to a gas mass flow detection method and device.
Background
The natural gas delivery pipe may be interfered by various factors in the process of transporting natural gas, so that potential safety hazards appear. For example, leaks in the natural gas line, changes in the chemical nature of the gas in the natural gas line, etc. can affect the safety and stability of the natural gas line in transporting the gas. Therefore, whether the natural gas transmission pipe has potential safety hazards in the process of transporting the natural gas can be determined by detecting the mass flow of the gas in the natural gas transmission pipe.
However, natural gas is unstable in temperature and pressure. In addition, the composition of natural gas often changes during natural gas delivery, and therefore, the accuracy of the mass flow rate of natural gas detected during natural gas delivery may be reduced.
Disclosure of Invention
The invention aims to provide a method and a device for detecting the mass flow of gas, which can improve the accuracy of detecting the mass flow of the gas.
The technical scheme for solving the technical problems is as follows:
in one aspect, the present invention provides a method for detecting a gas mass flow rate, comprising: and acquiring a first mass flow, a first density, a first volume flow and a second density corresponding to the gas in the gas delivery pipe. Wherein the first mass flow is determined based on a first mode, the first density is determined based on a second mode, the first volumetric flow is determined based on a third mode, and the second density is determined based on a fourth mode. The first mode, the second mode, the third mode, and the fourth mode are different from each other. And obtaining a target density based on the first density and the second density. A second mass flow rate of the gas is determined based on the target density and the first volume flow rate. A mass flow rate of the gas is determined based on the first mass flow rate and the second mass flow rate.
The beneficial effects of the invention are as follows: the accuracy of the mass flow detection of the gas can be improved.
Based on the technical proposal, the invention can also be improved as follows
Further, the gas delivery conduit includes a first section, and the first mass flow rate, the first density, the first volumetric flow rate, and the second density of the gas in the first section are acquired.
The beneficial effects of adopting the further scheme are as follows: it is clear where in the gas delivery conduit the first mass flow, the first density, the first volumetric flow, and the second density of the gas are determined.
Further, the gas generates an electromagnetic signal when flowing through the first interval; the first mode includes determining the first mass flow based on the electromagnetic signal.
The beneficial effects of adopting the further scheme are as follows: one possible implementation of the first approach is presented.
Further, the second mode includes determining the first density based on a time at which the gas flows through the first interval.
The beneficial effects of adopting the further scheme are as follows: one possible implementation of the second approach is given.
Further, the third mode includes determining the first volumetric flow rate based on a pressure of the gas at both ends of the first interval.
The beneficial effects of adopting the further scheme are as follows: one possible implementation of the third approach is given.
Further, the fourth aspect includes determining the second density based on a temperature and a pressure of the gas in the first interval.
The beneficial effects of adopting the further scheme are as follows: a possible implementation of the fourth aspect is presented.
Further, the target density is obtained based on the first density, the second density and a first preset formula; the first preset formula includes:
ρ′＝A×ρ g +(1-A)×ρ m ；
wherein ρ' is used to characterize the target density; ρ m For characterizing the first density; ρ g For characterizing the second density; a is used for representing a first correction coefficient; the first correction factor is a function associated with the pressure and temperature of the corresponding gas.
The beneficial effects of adopting the further scheme are as follows: a first preset formula is given, and the target density can be obtained based on the first density, the second density and the first preset formula.
Further, the product of the target density and the first volumetric flow rate is determined as the second mass flow rate.
The beneficial effects of adopting the further scheme are as follows: a specific implementation of determining the second mass flow is presented.
Further, the determining the mass flow of the gas based on the first mass flow, the second mass flow, and a second preset formula; the second preset formula includes:
Q′＝B×Q m +(1-B)×Q vm ；
wherein Q' is used to characterize the mass flow of the gas; q (Q) m For characterizing the first mass flow rate; q (Q) vm For characterizing the second mass flow rate; b is used for representing a second correction coefficient; the second correction factor is a function associated with the pressure and temperature of the corresponding gas.
The beneficial effects of adopting the further scheme are as follows: a second preset formula is given, based on the first mass flow, the second mass flow, and the second preset formula, the mass flow of the gas can be determined.
In another aspect, the present invention also provides a device for detecting a gas mass flow, including: a first sensor, a second sensor, a third sensor, and a transmitter. The first sensor, the second sensor, and the third sensor are different from each other. The first sensor is used for acquiring a first mass flow and a first density corresponding to the gas in the gas pipe. The second sensor is used for acquiring the first volume flow corresponding to the gas in the gas pipe. The third sensor is used for acquiring a second density corresponding to the gas in the gas pipe. The transmitter is used for obtaining a target density based on the first density and the second density. The transmitter is also configured to determine a second mass flow rate of the gas based on the target density and the first volume flow rate. The transmitter is also configured to determine a mass flow rate of the gas based on the first mass flow rate and the second mass flow rate.
The beneficial effects of the invention are as follows: the accuracy of the mass flow detection of the gas can be improved.
Drawings
FIG. 1 is a schematic flow chart of a method for detecting gas mass flow according to the present invention;
FIG. 2 is a schematic diagram of a gas mass flow rate detection device according to the present invention;
FIG. 3 is a schematic structural diagram of a first sensor according to the present invention;
FIG. 4 is a schematic diagram of a second sensor according to the present invention;
FIG. 5 is a schematic diagram of experimental data provided by the present invention;
fig. 6 is a schematic diagram of another experimental data provided by the present invention.
In the drawings, the list of components represented by the various numbers is as follows:
1. the sensor comprises a first sensor, 2, a second sensor, 3, a third sensor, 4, a transmitter, 11, a main body, 12, a measuring tube, 13, a vibration sensor, 14, an inner joint, 15, a flange, 16, a sealing head, 17, a pressure sensor, 18, a temperature sensor, 19 and a differential pressure sensor.
Detailed Description
The principles and features of the present invention are described below with examples given for the purpose of illustration only and are not intended to limit the scope of the invention.
Along with the development of the natural gas industry and the continuous expansion of the construction scale of natural gas long-distance pipelines, the mass flowmeter for measuring the mass flow of the gas is also widely applied to the natural gas long-distance pipelines. Meanwhile, with continuous progress and innovation of technology, performance and accuracy of the mass flowmeter are also continuously improved. Based on the mass flowmeter, the mass flow of the natural gas can be measured in the natural gas long-distance pipeline, so that the safe operation of the pipeline is ensured.
However, during the process of transporting natural gas, the state of the natural gas tends to drift. Further, since the distance for transporting the natural gas is different, it is necessary to transport the natural gas using different pipeline pressures in the transport pipeline. And, as the season changes, the temperature in the delivery pipe also changes continuously. These factors (natural gas conditions, pipeline pressure, temperature) all reduce the accuracy of the detected mass flow of natural gas during natural gas delivery.
Currently, most of the methods for measuring the mass flow of natural gas adopt a volumetric flow measurement mode. That is, the volume flow of the natural gas is measured first, and then parameters such as the temperature, the pressure and the like of the natural gas are measured to estimate the density of the natural gas. However, the density of natural gas obtained in this way is less accurate. Thus, the accuracy of the mass flow rate of natural gas determined based on the estimated density of natural gas is also low. To increase the accuracy of the mass flow rate of the obtained natural gas, it is necessary to perform the natural gas composition analysis first to increase the accuracy of the density of the obtained natural gas, thereby increasing the accuracy of the mass flow rate of the obtained natural gas.
However, during transportation of natural gas, the composition of natural gas may change from time to time, increasing the amount of work required for analysis of the components of natural gas. Thus, the efficiency of the mass flow of the resulting natural gas is reduced based on the above-described manner.
Based on the above problems, the present invention provides a gas mass flow rate detection method, see fig. 1, which includes steps S101 to S104.
S101: and acquiring a first mass flow, a first density, a first volume flow and a second density corresponding to the gas in the gas delivery pipe.
In some embodiments, the first mass flow is determined based on a first mode, the first density is determined based on a second mode, the first volumetric flow is determined based on a third mode, and the second density is determined based on a fourth mode. The first mode, the second mode, the third mode and the fourth mode are different from each other.
In some embodiments, the gas delivery conduit includes a first section therein. The first section is a portion of the tube space of the gas delivery tube. The first mass flow rate, the first density, the first volume flow rate and the second density corresponding to the gas in the gas delivery pipe are obtained, namely the first mass flow rate, the first density, the first volume flow rate and the second density of the gas in the first interval are obtained.
In some embodiments, a metallic coil is disposed in the first section, so that an electromagnetic signal is generated when the gas flows through the first section. The first mode includes determining a first mass flow rate based on the electromagnetic signal.
In some embodiments, the second mode includes determining the first density based on a time the gas flows through the first interval. The time that the gas flows through the first section is the time that the gas flows from one end of the first section to the other end of the first section. For example, the time for the gas to flow through the first section is 5 seconds.
In some embodiments, the third mode includes determining the first volumetric flow rate based on the pressure of the gas at both ends of the first interval.
In some embodiments, the fourth aspect includes determining the second density based on a temperature and a pressure of the gas in the first interval. Wherein the second density may be determined based on the temperature, the pressure, and the gas PVT equation in the first interval.
S102: the target density is obtained based on the first density and the second density.
In some embodiments, the target density may be derived based on the first density, the second density, and the first predetermined formula. The first preset formula is used for representing the corresponding relation among the first density, the second density and the target density.
In some embodiments, the first preset formula comprises: ρ' =a×ρ g +(1-A)×ρ m 。
Wherein ρ' is used to characterize the target density; ρ m For characterizing the first density; ρ g For characterizing the second density; a is used for representing a first correction coefficient; the first correction factor is a function associated with the pressure and temperature of the corresponding gas.
S103: a second mass flow of gas is determined based on the target density and the first volumetric flow.
In some embodiments, the product of the target density and the first volumetric flow rate may be determined as the second mass flow rate.
S104: a mass flow rate of the gas is determined based on the first mass flow rate and the second mass flow rate.
In some embodiments, the mass flow rate of the gas may be determined based on the first mass flow rate, the second mass flow rate, and a second preset formula. The second preset formula is used for representing the corresponding relation among the first mass flow, the second mass flow and the mass flow of the gas.
In some embodiments, the second preset formula comprises: q' =b×q m +(1-B)×Q vm 。
Wherein Q' is used to characterize the mass flow of the gas; q (Q) m For characterizing the first mass flow. Q (Q) vm For characterizing a second mass flow rate; and B is used for representing a second correction coefficient. The second correction factor is a function associated with the pressure and temperature of the corresponding gas.
The second correction coefficient may be the same as the first correction coefficient or may be different from the first correction coefficient. The first correction coefficient and the second correction coefficient can be set by a person skilled in the art based on the actual scene, and the embodiment of the present application is not limited.
The invention also provides a gas mass flow rate detection device, see fig. 2, comprising a first sensor 1, a second sensor 2, a third sensor 3 and a transmitter 4. The first sensor 1, the second sensor 2 and the third sensor 3 are different from each other.
The first sensor is used for acquiring a first mass flow and a first density corresponding to the gas in the gas pipe. The second sensor is used for acquiring a first volume flow corresponding to the gas in the gas delivery pipe. The third sensor is used for acquiring a second density corresponding to the gas in the gas transmission pipe.
The transmitter is configured to obtain a target density based on the first density and the second density. And determining a second mass flow of the gas based on the target density and the first volume flow. And determining a mass flow rate of the gas based on the first mass flow rate and the second mass flow rate.
In some embodiments, referring to fig. 3, the first sensor may include a body 11, a measurement tube 12. Wherein the measuring tube 12 is mounted on the body 11. The measuring tube 12 may take the form of a triangular, slightly curved, or straight tube. The body 11 is provided on both sides with an inner joint 14 and a flange 15. The inlet end and the outlet end of the measuring tube 12 are respectively communicated with the inner connectors 14 at two sides of the main body 11, and the two sides of the main body 11 are also provided with sealing heads 16, wherein the sealing heads 16 are used for sealing the inner connectors 14 and the main body 11. The vibration sensor 13 is mounted on the measurement pipe 12, and includes a drive sensor provided at a drive position of the measurement pipe 12 and a detection sensor for detecting a position of the measurement pipe 12. Wherein the vibration sensor 13 comprises a coil and magnetic steel matched with the coil for use. Since the vibration sensor 13 includes a coil and magnetic steel used in cooperation with the coil, an electromagnetic signal is generated when the gas flows through the vibration sensor 13, and the vibration sensor can determine a first mass flow rate corresponding to the gas based on the electromagnetic signal. And, the detection sensor can detect the time when the gas flows through the measurement pipe 12 and the number of times the measurement pipe vibrates during that time. The detection sensor can determine the frequency of the vibration of the measurement tube during this time based on the time the gas flows through the measurement tube 12 and the number of vibrations of the measurement tube during this time. Based on the frequency of the vibration of the measurement tube during this time, a corresponding first density of the gas can be determined.
In some embodiments, considering that under the working condition of natural gas transportation, the coriolis force generated by the gas in the measuring tube is often very small, so in order to make the measurement result more accurate, the number of turns of the coil of the vibration sensor can be set to 1200, the magnetic steel is ferromagnetic steel, and the magnetic flux density of the ferromagnetic steel is 1.5T, so that the magnetic induction intensity of the ferromagnetic steel is larger, the induced electromotive force generated by the gas is stronger, and the electric signal detected by the coil is stronger. Because the coriolis force is very small under the natural gas pipeline working condition, the signal detected by the detection coil is reduced, and the signal quality is influenced, so that the strength and the quality of the detection signal are improved by matching the strong magnetic steel with the coil, and a more accurate measurement result can be obtained.
In some embodiments, referring to FIG. 4, the second sensor may comprise a differential pressure transmitter 19, with pressure taps of the differential pressure transmitter 19 being disposed on the lines at each end of the first sensor. Differential pressure transmitter 19 can sense the pressure of the gas at the line location across the first sensor. Wherein the second sensor may further comprise a first calculation module, which may determine a first volumetric flow rate for the gas based on the pressure.
In some embodiments, the third sensor may be based on a combination of a pressure sensor and a temperature sensor. The pressure sensor can acquire the pressure of the gas, and the temperature sensor can acquire the temperature of the gas. The third sensor may further include a second calculation module that may determine a second density corresponding to the gas based on the pressure and the temperature of the gas.
In some embodiments, with continued reference to fig. 4, in view of the fact that the measurement tube 12 has a certain bending at the inlet and outlet ends, thereby creating a certain pressure drop, in order to be able to measure the gas pressure more accurately, a pressure sensor 17 may be provided at the inlet end of the measurement tube 12, and the pressure sensor 17 is an absolute pressure sensor. The pressure sensor 17 is connected to the connection part of the flange 15 and the sealing head 16 at the inlet end of the measuring tube 12 through the pressure meter connector 19, and the gas pressure measured by the pressure sensor 17 is absolute pressure, so that the gas density obtained by subsequent calculation is more accurate.
In some embodiments, with continued reference to FIG. 3, the temperature sensor 18 is disposed against the outer wall of the measurement tube 12, taking advantage of the faster heat transfer characteristics, making the measurement process faster and the measured gas temperature more accurate. And the temperature sensor can adopt a platinum resistance temperature sensor, so that the average working condition temperature in a certain time can be obtained, and the accuracy of a measurement result is improved.
In some embodiments, with continued reference to FIG. 3, transmitter 4 includes a third computing module and a memory module. Transmitter 4 is connected to main body 11 by a connector and is fixed to an intermediate position of main body 11. The first sensor, the second sensor and the third sensor are respectively connected with the computing module through cable communication.
In some embodiments, the transmitter may further include a signal conditioning module, a working condition acquisition module, a communication module, a display module, a power module, and the like, and embodiments of the present application are not limited.
In some embodiments, after the first sensor determines a first mass flow rate and a first density for the gas, the first mass flow rate and the first density can be sent to the transmitter. After the second sensor determines the first volumetric flow rate corresponding to the gas, the first volumetric flow rate may also be sent to the transmitter. After the third sensor determines a second density for the gas, the second density can also be sent to the transmitter.
In some embodiments, a computing module of the transmitter can derive based on the first density and the second densityTarget density. The transmitter may obtain the target density based on the first density, the second density, and a first preset formula. The first preset formula is used for representing the corresponding relation among the first density, the second density and the target density. The first preset formula includes: ρ' =a×ρ g +(1-A)×ρ m 。
Wherein ρ' is used to characterize the target density; ρ m For characterizing the first density; ρ g For characterizing the second density; a is used for representing a first correction coefficient; the first correction factor is a function associated with the pressure and temperature of the corresponding gas.
In some embodiments, after the transmitter determines the target density, the calculation module of the transmitter may also determine a second mass flow of gas based on the target density and the first volume flow. Wherein the second mass flow rate Q of the gas vm =first volumetric flow Q v X target density ρ'.
In some embodiments, after the transmitter determines the second mass flow rate of the gas, the computing module of the transmitter may also determine the mass flow rate of the gas based on the first mass flow rate and the second mass flow rate. The transmitter may determine the mass flow rate of the gas based on the first mass flow rate, the second mass flow rate, and a second predetermined formula. The second preset formula is used for representing the corresponding relation among the first mass flow, the second mass flow and the mass flow of the gas. The second preset formula includes: q' =b×q m +(1-B)×Q vm 。
Wherein Q' is used to characterize the mass flow of the gas; q (Q) m For characterizing the first mass flow. Q (Q) vm For characterizing a second mass flow rate; and B is used for representing a second correction coefficient. The second correction factor is a function associated with the pressure and temperature of the corresponding gas.
The invention also provides a gas mass flow detection device which comprises a first sensor, a second sensor, a third sensor and a transmitter. The transmitter comprises a calculation module and a storage module. The first sensor, the second sensor, and the third sensor are different from each other.
In some embodiments, the first sensor may be a coriolis force sensor that includes a measurement tube, a vibration sensor, and a detection sensor. The vibration sensor is used for detecting the vibration frequency of the measuring tube. When gas passes through the measuring tube, the calculation module of the transmitter can collect electromagnetic signals detected by the vibration sensors, and after the electromagnetic signals are amplified and processed by the transmitter, the calculation module can calculate the phase difference among the vibration sensors. Since the phase difference of the gas flowing through the coriolis force sensor is proportional to the mass flow rate of the gas, the calculation module of the transmitter can calculate the corresponding first mass flow rate of the gas.
Also, according to the first order spring vibration principle, since the density of the medium in the first sensor is inversely proportional to the square of the vibration frequency of the measuring tube 12, the calculation module of the transmitter 4 can calculate the first density using this principle.
In some embodiments, the second sensor may be a differential pressure sensor, and the pressure loss occurs when the gas flows through the first sensor due to the shutoff phenomenon caused by the diameter variation of the measuring tube of the first sensor. The larger the flow velocity of the gas flowing through the measuring tube is, the larger the pressure loss is, and the second sensor can acquire the pressure loss signal of the gas flowing through the first sensor in real time. The calculation module of the transmitter can obtain the first volume flow corresponding to the gas by utilizing the acquired differential pressure.
In some embodiments, the third sensor comprises an absolute pressure sensor and a temperature sensor. The absolute pressure sensor can measure the pressure of the gas in real time, and the temperature sensor is mounted on the measuring tube of the first sensor. The temperature sensor may measure the temperature of the gas in real time.
It should be noted that, in consideration of the gas temperature, pressure, etc. under the gas transmission condition, the pressure and temperature are average working condition pressure and average working condition temperature after filtering treatment in a certain time in order to improve the accuracy of the final measurement result. After the calculation module acquires the pressure and the temperature detected by the third sensor, combining a gas PVT equation:a second density may be obtained. Wherein ρ is g For characterizing the second density, P for characterizing the pressure detected by the third sensor, T for characterizing the temperature detected by the third sensor, ρ 0 For characterising standard atmospheric pressure, T 0 For characterization of absolute temperature.
In some embodiments, the calculation module uses the vibration frequency of the measurement tube in the first sensor to determine a first density, and uses the pressure and temperature measured by the third sensor to obtain a second density, the first density and the second density being the current density of the gas calculated based on the different modes. The confidence of the gas density obtained in the two modes is different under different pressures and temperatures, for example, the confidence of the first density obtained by the first sensor is higher under the conditions that the pressure is higher than 1MPa and the temperature is higher than 30 ℃. The second density obtained with the third sensor has a higher reliability at a pressure lower than 1MPa and a temperature lower than 20 ℃. Therefore, in order to improve the accuracy of the obtained gas density, a data model based on the pressure, the temperature and the first correction coefficient may be stored in the storage module.
The calculation module may calculate the first correction coefficient a according to the pressure and the temperature measured by the third sensor. The first correction factor a is a function associated with the pressure and temperature of the corresponding gas. The calculation module may then calculate the first density ρ based on the correction factor A m And a second density ρ g The corrected gas density is calculated to obtain the target density rho', and the calculation method is as follows:
in some embodiments, the calculation module calculates the first volumetric flow rate Q by differential pressure principles of the second sensor v And a target density ρ' to obtain a second measured mass flow rate Q vm . Wherein Q is vm ＝Q v ×ρ′。
In some embodiments, the confidence of the measurement method is different after the calculation module determines the first mass flow rate and the second mass flow rate. Therefore, in order to improve the accuracy of the mass flow of the obtained gas, a data model based on the pressure, the temperature and the first correction coefficient may be stored in the storage module.
The calculating module may calculate the second correction coefficient B according to the pressure and the temperature measured by the third sensor. The second correction factor B is a function associated with the pressure and temperature of the corresponding gas. The calculation module may then calculate the first mass flow rate Q based on the second correction factor B m And a second mass flow rate Q vm The corrected gas mass flow is calculated to obtain the gas mass flow, and the calculation method is as follows:
in order to more fully describe the embodiments of the present application, the results of detecting the mass flow of the gas based on the methods and apparatuses provided in the embodiments of the present application will be analyzed in conjunction with actual experimental data.
Referring to fig. 5, the measured gas density, mass flow rate, and the like are data under a plurality of different operating conditions of pressure P and operating temperature T. As can be seen directly from fig. 5, under the same conditions of the working pressure P and the working temperature T, the corrected measured gas mass flow rate is closer to the standard mass flow rate, and the error between the corrected measured correlated mass flow rate and the standard mass flow rate is much smaller than the error between the measured correlated mass flow rate and the standard mass flow rate before correction.
Referring to fig. 6, another example of data for gas density, mass flow, etc. measured at a plurality of different operating pressures P and operating temperatures T is shown. As can be seen directly from fig. 6, under the same condition of the working condition pressure P and the working condition temperature T, the density measured after correction is closer to the standard mixed density, and compared with the density before correction, the error between the density measured after correction and the standard density is much smaller than the error between the density measured before correction and the standard density.
The gas mass flow detection method and the device provided by the invention are not influenced by the temperature, the density and the flow channel state of the gas, can improve the accuracy of the detected mass flow of the gas, and have wide measurable range. In addition, as no barrier exists in the measuring tube of the device provided by the invention, dirt is not easy to deposit, corrosion and abrasion are not easy to occur, the device is convenient to clean, the maintenance workload is small, the structure is simple, and the device is convenient to install. The method can be widely applied to detection of gas mass flow.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (10)

1. A method of detecting a gas mass flow rate, comprising:
acquiring a first mass flow rate, a first density, a first volume flow rate and a second density corresponding to gas in a gas delivery pipe; wherein the first mass flow is determined based on a first manner; the first density is determined based on a second manner; the first volumetric flow rate is determined based on a third mode; the second density is determined based on a fourth aspect; the first mode, the second mode, the third mode, and the fourth mode are different from each other;
obtaining a target density based on the first density and the second density;
determining a second mass flow rate of the gas based on the target density and the first volume flow rate;
a mass flow rate of the gas is determined based on the first mass flow rate and the second mass flow rate.
2. The method of claim 1, wherein the gas delivery conduit includes a first section, the acquiring a first mass flow rate, a first density, a first volumetric flow rate, and a second density corresponding to the gas in the gas delivery conduit includes:
the first mass flow rate, the first density, the first volumetric flow rate, and the second density of the gas in the first interval are obtained.
3. The method of claim 2, wherein the gas flowing through the first zone generates an electromagnetic signal; the first mode includes determining the first mass flow based on the electromagnetic signal.
4. The method of claim 2, wherein the second manner comprises determining the first density based on a time the gas flows through the first interval.
5. The method of claim 2, wherein the third mode includes determining the first volumetric flow rate based on a pressure of the gas at both ends of the first interval.
6. The method of claim 2, wherein the fourth aspect comprises determining the second density based on a temperature and a pressure of the gas in the first interval.
7. The method according to claim 1 or 2, wherein the deriving a target density based on the first density and the second density comprises:
obtaining the target density based on the first density, the second density and a first preset formula; the first preset formula includes:
ρ'＝A×ρ g +(1-A)×ρ m ；
wherein ρ' is used to characterize the target density; ρ m For characterizing the first density; ρ g For characterizing the second density; a is used for representing a first correction coefficient; the first correction factor is a function associated with the pressure and temperature of the corresponding gas.
8. The method of claim 1 or 2, wherein the determining the second mass flow of the gas based on the target density and the first volumetric flow comprises:
the product of the target density and the first volumetric flow rate is determined as the second mass flow rate.
9. The method according to claim 1 or 2, wherein said determining the mass flow of the gas based on the first and second mass flows comprises:
determining the mass flow of the gas based on the first mass flow, the second mass flow and a second preset formula; the second preset formula includes: q' =b×q m +(1-B)×Q vm ；
Wherein Q' is used to characterize the mass flow of the gas; q (Q) m For characterizing the first mass flow rate; q (Q) vm For characterizing the second mass flow rate; b is used for representing a second correction coefficient; the second correction factor is a function associated with the pressure and temperature of the corresponding gas.
10. A gas mass flow rate detection device, comprising: a first sensor, a second sensor, a third sensor, and a transmitter; the first sensor, the second sensor, and the third sensor are different from each other;
the first sensor is used for acquiring a first mass flow and a first density corresponding to the gas in the gas pipe;
the second sensor is used for acquiring a first volume flow corresponding to the gas in the gas pipe;
the third sensor is used for acquiring a second density corresponding to the gas in the gas pipe;
the transmitter is used for obtaining a target density based on the first density and the second density;
the transmitter is further configured to determine a second mass flow rate of the gas based on the target density and the first volume flow rate;
the transmitter is also configured to determine a mass flow rate of the gas based on the first mass flow rate and the second mass flow rate.
CN202311412156.6A 2023-10-27 2023-10-27 Gas mass flow detection method and device Pending CN117367529A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311412156.6A CN117367529A (en) 2023-10-27 2023-10-27 Gas mass flow detection method and device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311412156.6A CN117367529A (en) 2023-10-27 2023-10-27 Gas mass flow detection method and device

Publications (1)

Publication Number Publication Date
CN117367529A true CN117367529A (en) 2024-01-09

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